.stuone{
    width: 740px;
    height: 539px;
    background: white;
    position: absolute;
    top: 43px;
    text-align: left;
    overflow:scroll
}
.stuone>h3{
    margin-top: 20px;
    margin-bottom: 30px;
    text-align: center;
}
.stuone li{
    margin-bottom: 20px;
    margin-left: 20px;
}
.stuone img{
    width: 600px;
    height: 300px;
}
.onas{
    width: 100%;
    height: 200px;
    background: red;
}